Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | Information technology -- Coding of audio-visual objects (formal name) MPEG-4, Visual Coding, Simple Scalable Profile |
| Description | See also MP4_FF_2 and MPEG-4_V. Intended to serve the same applications as the Simple Profile (mobile audio-visual services, low-complexity video for the Internet, and small camera devices that record to disk or memory chips) but adds scalability.1
The Simple Scalable Profile permits the use of the following visual object types: • Simple: rectangular video, uses intra (I) and predicted (P) video object planes (VOPs, the MPEG-4 term for frames). • Simple Scalable: rectangular video, adds bidirectional (B) video object planes (VOPs), and permits temporal and spatial scalability, which entail the use of layers similar to those in JPEG 2000. The Simple Scalable Profile permits the use of three compression levels which build on Levels 1 and 2 of the Simple Profile. |
| Production phase | Generally a final-state (end-user delivery) format. |
| Relationship to other formats | |
| Subtype of | MPEG-4_V, MPEG-4, Visual Coding (Part 2) |
| Used by | MP4_FF_2_V, MPEG-4 File Format, V.2, with Visual Coding (All Profiles) |
| LC experience or existing holdings | |
| LC preference |
| Disclosure | Open standard. See MP4_FF_2. |
| Documentation | See MP4_FF_2. |
| Adoption | Actual adoption not known to the compilers of this document. |
| Licensing and patent claims | See MP4_FF_2. |
| Transparency | See MP4_FF_2. |
| Self-documentation | See MP4_FF_2. |
| External dependencies | See MP4_FF_2. |
| Technical protection considerations | See MP4_FF_2. |
| Normal rendering | Good support. |
| Clarity (support for high image resolution) | See MP4_FF_2 and MPEG-4_V. Other profiles will produce greater clarity than the Simple Scalable Profile at a given picture size, data rate, and encoding algorithm. |
| Fidelity (support for high audio resolution) | See MP4_FF_2. |
| Support for multiple sound channels | See MP4_FF_2. |
| Functionality beyond normal video rendering | See MP4_FF_2. |
| Tag type | Value | Note |
| Filename Extension | mp4 | |
| Internet Media Type | See MP4_FF_2 | |
| Magic numbers | See MP4_FF_2 | |
| Profile and level indicators | 00010000, 00010001, 00010010 | For profile_and_level_indication for Simple Scalable Profile, levels 0, 1, and 2. From Annex G of Part 2 of the standard, pp. 454-55, and Amendment 3 (2003). |
| File type brand | See note | Indicated in file wrapper and relates to "brands" defined in ISO_BMFF. Wrapping MPEG-4_V bitstreams in MP4_FF_1 would occasion the use of mp41; in MP4_FF_2, use mp42. See Part 15 of the standard, pp. 2-9, 13. |
| General | |
| History |
URLs
Print
• See MP4_FF_2.
URLs
• See MP4_FF_2.
Print
• See MP4_FF_2.
1Pereira, Fernando, and Touradj Ebrahimi, The MPEG-4 Book, Upper Saddle River, NJ: IMSC Press, 2002, p. 598.
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